Twice now I have switched off my 3g iphone for approx 5days, (circumstances dictate the phone must be switched off). The iphone was nearly fully charged before it was switched off but when I switched it back on the battery has been flat on both occassions. Could some app be running in the background even after it is switched off? The phone is jailbroken and I have Cydia, WinSCP, OpenSSH, BossPrefs and Winterboard installed. Help to understand what might be happening would be greatly appreciated.